31
Stitching off the machine
17. Adjustment of the bobbin thread tension
Requirement:
The thread pull weight of the bobbin thread using cotton thread 50/2 should be approx. 30 to 35 g.
Check:
● When the threaded bobbin case is hanging on its thread, it must not be caused to slip downwards
by its own weight.
● It must drop stepwise, however, on sharp upward movements of the hand.
● There must not be any thread fragments under the tension spring.
● The tension spring must rest evenly on the bobbin case.
Adjustment:
● Loosen the screw slightly and then turn it again, tightening the screw until you feel resistance
when pulling the thread (fig. 17).
Test:
● Carry out as described in “check”.
Note:
When the bobbin thread tension is adjusted correctly, all other adjustments to the tension should
be carried out only on the needle thread tension.
To Next Page
Loading...
